package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面类：实现公关字段填充
 */

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    /**
     * 定义切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}

    /**
     * 前置通知
     *
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开启公共字段的自动填充");
        //获取被拦截方法的参数类型
        MethodSignature methodSignature = (MethodSignature)joinPoint.getSignature(); //获得方法签名对象
        AutoFill autoFill = methodSignature.getMethod().getAnnotation(AutoFill.class); //获得方法的注解对象
        OperationType operationType = autoFill.value(); //获得操作类型

        //获取被拦截方法的参数 --实体对象
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0) return;
        Object entity = args[0]; //约定第一个对象作为实体对象


        //准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long id = BaseContext.getCurrentId();

        //为实体对象的公共字段赋值
        if(operationType == OperationType.INSERT){
            try {
                //通过反射为4个公共字段赋值
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
                setCreateUser.invoke(entity,id);
                setUpdateUser.invoke(entity,id);

            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }else {
            try {
                //通过反射为2个公共字段赋值
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,id);

            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }
}
